1287 Каталог KORLOY 2020 Инструмент и оснастка для станков по металлу Стр.L27

Каталог KORLOY 2020 Инструмент для станков по металлу Стр. L27 1287 Lab2u

Endmills O Endmill’s shape and names Peripheral Cutting edge The 2nd relief angle The comparison according to number of flute Features of number of flute 010mm 2 flutes 3 flutes 4 flutes Pf . Shape ( ( j j (( ..)) 11 .)) Cross section 44mm2 46mm2 48mm2 Ratio 56% 58% 61% Advantages Good chip flow Good chip flow High rigidity Disadvantages Weak rigidity Difficultto measure External dameter Bad chip flow Side facing, Grooving Side facing, Grooving Side cutting Multi-functional Medium, finishing Finishing Affection of number of flute Specification Major features 2 flutes 4 flutes Tool rigidity Torsional rigidity 0 Bending rigidity 0 Surface finish Surface roughness 0 Machining precision 0 Chip control Chip clogging 0 Chip evacuation 0 Grooving Chip evacuation 0 Grooving 0 Side facing Surface finish 0 Vibration 0 : Excellent 0: Good O The differences between general endmills and high speed endmills General endmills High speed endmills Cross section shape Features Cross section shape Features - Applied for Low speed, High depth of cut, Low feed - Low hardness workpiece(general steel, cast iron) - Applied for high speed, low depth of cut, high feed - Useful for hardened workpiece such as die steel O Calculations of cutting condition Calculations of Cutting speed vc = ix D x n 1000 n = 1000 x vc ix D Calculations of feed speed vf = n x fn or n x fz x z vf fn fn = n fz = -or z vc: Cutting speed (m/min) vf: Feed speed (m/min) n: Circular constant (3.141592) fn: Feed per revolution (mm/rev) D: Endmill diameter (mm) fz: Feed per flute (mm/t) n: Revolution per minute (min-1) z: Number of flute O Ball endmills cutting speed calculation formulas Revolution per minute Cutting speed Feed per tooth Feed per revolution Feed speed Chip removal rate Effective diameter of Ball Endmill vcx1000 Dxn vc = Dxn xn 1000 fz = vf zxn fn = fz x z vf = fz x z x n Q = ae x ap x vf Deff = 2 x -/DXap-ap2 Calculation v v v Table Deff = Dxsin fS±arccos( D ap) Technical Information 27 n = n x z